If a full floater rear suspension would have been advantageous and without major compromises for the new and freshly redesigned Superfly 100 then I am sure Trek would have gone that direction. Personally the new SF100 rides like a rocketship and all the DRCV-equipped bikes I have ridden have a lot more "butter" to them. I would say that DRCV is trail-tech and not race-tech.

Agree on the DRCV. It's not everybodys taste.
But the FullFloater is by far better in any situation & particular at steep climps with rocks & roots.
Therefore the FullFloater with 29er wheels will be also for xc racing the best performer, from my point if view at least

I think for the SF's Trek had the weight higher weighted in their specification sheet as kinematics performance. Hopefully they learn a little bit now (see the posts with broken lower headset bearing cups in the manufacturers area) & use the Apollo technology in 2014 or 2015 for a 29er TopFuel
Another reason could be, that the SF's were ready as former GF, so Trek was able to save effort & spend all the R&D capacities on the more requested bikes: EX & Remedy. Comprehensible for me.

Perhaps I'm alone with my opinion, but I think Trek's FullFloater is the best rear sus available & I don't see a reason why a XC racer shouldn't have this advantage on his bike.
For sure the current SF's are fast, but they could be faster, or more effective finally.